I can't give you exact numbers, but certainly the investment involved in a new pipeline is greater than the investment involved in a repurposed pipeline.
For a repurposed pipeline, there are new components, including new pump stations. All of the shut-off valves have to be replaced. The ones in existence for the natural gas system are only designed for natural gas service, so they have to be replaced. There is also some cost involved with isolating the pipe from the original gas system and creating the new oil system. But I can't give you exact figures in terms of what the difference would be between a repurposed pipeline and a new pipeline.